Fix jsonpatch in go.sum

[ncdc]

What this PR does / why we need it:
This should fix issues encountered when working with go modules, GOPROXY, and jsonpatch.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:
I edited hack/update-deps.sh and added GOPROXY=https://proxy.golang.org

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

NONE

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[ncdc]

/assign @chuckha @detiber

[ncdc]

@cblecker @BenTheElder is this the right thing to do?

[ncdc]

/hold
pending discussions in kubernetes-sigs/cluster-api#1217

[ncdc]

I've updated the CAPI PR and it's in the merge queue.

/hold cancel
/assign @detiber

[detiber]

/lgtm

[ncdc]

Needs approval too - thanks!

[detiber]

oops 😂
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: detiber, ncdc

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